A statement from his office said he is &ldquo;on a medical leave of absence and is being treated for exhaustion.&rdquo;

&ldquo;He asks that you respect his family&rsquo;s privacy,&rdquo; the statement said. &ldquo;His offices remain open to serve residents of the Second District.&rdquo;

The statement said Jackson has been on leave since June 10. His last recorded vote was June 8.

Jackson&rsquo;s name was dragged into the ongoing drama over former Gov. Rod Blagojevich&rsquo;s decision-making process on filling an empty Senate seat. Jackson has repeatedly denied authorizing anyone to approach Blagojevich on his behalf.